X030642019-03-1200001093557DEXCOM INCDXCM0001446422MOY JEFFREY6340 SEQUENCE DRIVESAN DIEGOCA921210100SVP OperationsCommon Stock2019-03-125J055000.0D53110DCommon Stock2019-03-125J036470.0D49463DCommon Stock2019-03-125J0100310.0D39432DCommon Stock2019-03-125J055000.0A22211Iby TrustCommon Stock2019-03-125J036470.0A25858Iby TrustCommon Stock2019-03-125J0100310.0A35889Iby TrustCommon Stock2019-03-124S01936142.7922D33953Iby TrustCommon Stock2019-03-124S05001142.7922D28952Iby TrustCommon Stock2019-03-124S01594142.7922D27358Iby TrustShares were transferred from direct ownership to ownership under the Moy Family Trust upon vesting of previously awarded restricted stock units.Included in this number are 39,070 unvested restricted stock units, 11,714 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 20,062 of which were granted on March 8, 2018 and shall vest through March 8, 2021 and 7,294 of which were granted on March 8, 2017 and shall vest through March 8, 2020.Shares are held by the Moy Family Trust U/A/D 12/09/2013, with respect to which the reporting person is a trustee.Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the reporting person.By: Timothy O'Brien For: Jeffrey Moy2019-03-13